Elastic oldham coupling



Jul 31, 1923- F. KRATZ ELASTIC OLDHAM COUPLING V 'Filed uly 1', 1922 Patented July 31, 1923.

*- unites st am 1,ee3,396 Parent F C D-j FRANZ 'xnnrz, or STUTTGABT, GERMANY, 'ASSIGNOR TO no'nnn'r Boson AKTIEN'G'EJ SELLSCHAFT, or STUTTGART,--'GERIVIANY. I

ELASTIC OLDHAIi/I COUPLING.

Application iiled July e1, 1922. Serial No. 578,675.

T 0 all whom it concern:

Be it known that I, FRANZ KRATZ, a citizen of Germany, residing at Stuttgart, Ger many, have invented certain new and useful Improvements in Elastic Qldham Couplings, of which the following is a specification.

This invention relates to an Oldham coupling which is elastic in its circumferential direction and is distinguished from similar couplings by being composed of but a few parts which are, in most cases, of equal construction whereby the manufacture of the coupling and the assembling of its parts is greatly simplified, 1

According to this invention, the intermediate member or coupling member, as peculiar to the Oldham coupling, is radially cut open between a lug of the driving coupling half and a lug of the driven coupling half; elastic insertions are placed into the gaps thus formed, and the various parts of the intermediate member are held together by means of a suitable fitting as is all more fully described hereinafter.

My invention is illustrated, by Way of example, in the accompanying drawing, in which Fig. l is an axial section through the coupling parts in line AB of Figures 2 and 8. Fig. 2 is a frontal view of the coupling. Fig. 3 is a transverse section through the intermediate member of the coupling in line CD of Figure 1.

Referring to Figure 1, a and Z) are the ends of the shafts to be coupled by the coupling halves, of which 0 is affixed to the shaft (4, and (Z to the shaft 6. The coupling half a has lugs c, and the coupling half has lugs 7. These lugs engage corresponding recesses of an intermediate member 9 which, preferably, consists of vulcanized fibre. The lugs e of the coupling ialf 0 engage the recesses h, and the lugs f of the coupling half d engage the recesses i of the intermediate member 9. V

v This member which in the ordinary rigid Oldham coupling is a simple disk with a cross-shaped double-slot is composed of four separate parts is, m, n, 0, formed by radial cuts g. The width of these cuts, or slots respectively, is such that the parts 70, m, n, 0,

V have as much play relatively to each other as is required for the yieldableness of the coupling.

Holding these parts together is efiected by a closed ring p of iU-shaped transverse section, in which they are loosely inserted;

The parallel surfaces ofeach out or gap, or slot ghave oppositely located cavities of circular curve, and each pair of these cavities holds a hollow india-rubber roll 1",

these rolls permitting ofthe relative displaceability of the parts is, m, a, 0, in the circumferential direction of the coupling; in other words, said rolls warrant the elastic transmission of the power from the shaft (1 to the shaft 2').

Instead of the indie-rubber rolls other buffers may be employed, for instance prismatic bodies of india-rubber or the like, or coiled springs, or leaf springs, or the like.

Having now described my invention, what I desire to secure by a patent of the United States is: I 1. An elastic Oldham coupling, compris-. ing, in combination a driving coupling half, and transmitting lugs projecting from this half towards the driven coupling half; a driven coupling half, and transmitting lugs projecting from this half towards the driving coupling half; an intermediate transmitting member composed of a plurality of parts having gaps between them and containing each a portion of the cross-shaped double-slot of the coupling; elastic insertions in said gaps; and means for holding together theparts of theintermediate transmitting member, as set'forth.

2. An elastic Oldham coupling, comprising, in combination a driving coupling half, and transmitting lugs projecting from this half towards the driven coupling half; a driven coupling half, and transmitting lugs projecting from this half towards the driv- 'ing coupling half; and intermediate trans-' driven coupling half, and transmitting lugs I projecting from this half towards the driving coupling half, an intermediate trans"- mitting member composed of a plurality of parts having gaps between them and con tai'n-i ngv each a portion of the cross-shaped doub1e-slot of the coupling; india-rubber bodies inserted into said gaps; and means for holding together the parts of the interinediate transmitting member, as set forth.

4:. An elastic Oldhani coupling; comprising in combination a driving coupling half, andtransmitting lugs projecting from this half towards driven coupling half; a

drivencoupling half, and transmitting lugs projecting from-this half towards the driving' coup'hng' half an intermediate transmitting member composed ofa plurality of parts having gaps between them and containing each a portion of the cross-shaped double-slot of the coupling; elasticinsertions in said gaps; and a ring having U-shaped 20 FRANZ KRATZ; 1.8.

WVitnesses v I FRANK H, REDIKER; WALTER BEAU-N. 

